Petrochemical combustion carbon dioxide content detection equipment

Abstract

The invention relates to the technical field of carbon dioxide detection, in particular to petrochemical combustion carbon dioxide content detection equipment which comprises a non-dispersive infrared gas analyzer, a shell is arranged outside the non-dispersive infrared gas analyzer, the non-dispersive infrared gas analyzer is provided with a gas inlet and a gas outlet, a sampling pipe is inserted into the gas inlet, and a gas outlet is formed in the gas outlet. A sampling head is arranged at one end of the sampling pipe, a gas backflow prevention structure is arranged in the sampling head, when potential backflow occurs, reverse airflow tries to enter from the small opening end of the flow guide cover, at the moment, airflow resistance can be greatly increased by the intercepting groove, and due to the existence of the intercepting groove, the reverse airflow needs to overcome larger resistance to pass; and the backflow gas is bounced back after impacting the baffle plate at one end of the flow guide cover, so that the backflow of the gas is blocked, and meanwhile, the design of the conical flow guide cover can shrink a channel of the backflow gas, so that the resistance is further improved, and the reverse flow of the gas is effectively inhibited and the backflow of the gas is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide detection, in particular to a device for detecting carbon dioxide content in petrochemical combustion. Background Art

[0002] Petrochemical combustion refers to the combustion of fossil fuels such as oil, natural gas, and coal, which, through the use of oxygen, converts these hydrocarbons into carbon dioxide and water, releasing heat energy that is used for power generation, heating, or industrial production. This is particularly true during the refining process, where coke or residual carbon is often produced. These byproducts typically need to be incinerated in specialized furnaces for energy recovery or waste disposal. The flue gas produced by this combustion process has a complex composition and a high CO2 content, necessitating rigorous testing. The industry uses non-dispersive infrared gas analyzers to detect CO2 concentrations in the gas, and the CO2 concentration displayed on the analyzer allows for monitoring of the air environment.

[0003] The working principle of the non-dispersive infrared gas analyzer is based on the absorption characteristics of gas molecules to infrared radiation of a specific wavelength. By emitting an infrared light source, after the light passes through the gas sample to be tested in the sample chamber, the detector measures the change in the intensity of the residual light, thereby inferring the concentration of the target gas (such as carbon dioxide) in the gas. Before the gas enters the sample chamber, the filter and desiccant on the inner wall remove moisture and particulate impurities in the gas, thereby improving the accuracy of detection.

[0004] However, existing non-dispersive infrared gas analyzers have the following disadvantages:

[0005] (1) When the pressure of the gas collection system (sampling tube, sampling head, and vacuum pump) and the analysis system suddenly changes, the valve or check valve is damaged, the pipeline is poorly sealed, or the design is unreasonable, the gas flows in the opposite direction of the inlet direction. This process is called "backflow". "Backflow" destroys the stability and consistency of the gas flow inside the gas analyzer. The measured gas, which should flow unidirectionally through the gas chamber, is diluted or disturbed by the backflowing gas, causing the gas component ratio in the gas chamber to deviate from the actual concentration, thereby causing measurement errors. Existing non-dispersive infrared gas analyzers cannot achieve the anti-backflow function.

[0006] (2) During the petrochemical combustion process, the water content in the fuel and the water vapor in the combustion products will be discharged along with the flue gas. When the sampling tube collects the flue gas, the moisture in the flue gas will also enter. The moisture will interfere with the transmission of infrared light and affect the accurate detection of the target gas. In addition, excessive moisture may also cause condensation inside the instrument, corrode the circuit or optical components, cause instrument corrosion, mirror contamination and measurement errors, and affect the normal operation and long-term stability of the equipment. Although the existing method of using desiccant to remove moisture can reduce the interference of moisture on the analyzer to a certain extent, the dehumidification effect is limited, and the removed moisture or water is directly lost, and it is impossible to recycle the removed moisture or water, resulting in resource waste and environmental burden.

[0007] (3) When the existing non-dispersive infrared gas analyzer uses a filter to filter impurities in the flue gas, the filter is exposed to a high humidity and high particulate matter content flue gas environment for a long time, and the coke dust in the flue gas gradually accumulates and blocks the mesh, resulting in increased gas flow resistance, decreased flow rate, and even complete blockage. This blockage not only prolongs the response time of gas detection but also reduces the accuracy of detection. Summary of the Invention

[0008] The purpose of the present invention is to provide a device for detecting carbon dioxide content in petrochemical combustion to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a petrochemical combustion carbon dioxide content detection device, comprising a non-dispersive infrared gas analyzer, the non-dispersive infrared gas analyzer having a shell on the outside, the non-dispersive infrared gas analyzer being provided with an air inlet and an exhaust port, the air inlet being connected with a sampling tube, one end of the sampling tube being a sampling head, the interior of the sampling head being provided with a gas backflow prevention structure, the anti-backflow structure preventing the extracted gas from flowing back and being discharged, thereby ensuring the continuity and accuracy of the detection data, the interior of the shell being provided with a pretreatment structure, the pretreatment structure being used for filtering and dehumidifying the gas, and the non-dispersive infrared gas analyzer having an external collection container for conveniently receiving water discharged from the two drainage pipes.

[0010] Preferably, the anti-backflow structure includes a guide cover fixed on the inner wall of the sampling head, a cutoff groove is formed between the guide cover and the sampling head, a dehumidification unit is provided inside the sampling head, the dehumidification unit includes a cavity provided on the inner wall of the guide cover, and a condensation sheet is installed inside the cavity.

[0011] Preferably, the non-dispersive infrared gas analyzer is provided with a collection structure, which includes a guide groove arranged on the inner wall of the guide cover, a baffle arranged at the end of the guide cover with a smaller diameter, a water tank arranged inside the shell, and the sampling head is provided with a groove. The sampling head is connected to a water pipe at the groove, and the end of the water pipe is connected to the water tank.

[0012] Preferably, a cooling structure is provided inside the shell, and the cooling structure includes heat dissipation holes. Two groups of upper and lower connected hollow tubes are attached to the inside of the shell. A micro pump is installed on the top of the water tank, and the water suction pipe of the micro pump is located inside the water tank. The drain pipe of the micro pump is connected to the hollow tube. A water level sensor is installed inside the water tank, and the bottom of the water tank is connected to a first drain pipe, and the first drain pipe is connected to a solenoid valve.

[0013] Preferably, the pretreatment structure includes a treatment box, a perforated plate is fixed at the bottom of the inner cavity of the treatment box, a micro motor is installed on the outer wall of the treatment box, a movable shaft is connected to the inside of the treatment box for rotation, a pressure rod is fixed to the outside of the movable shaft, a slide is provided on the inner wall of the treatment box, and a groove plate and a pressure plate are connected to slide along the slide, the groove plate and the pressure plate are connected by a hollow plate, dry particles are placed inside the hollow plate, the side of the hollow plate is magnetically connected to the top of the treatment box with a shield plate, and the shield plate on the side of the hollow plate is provided with a circular hole, and a filter is inserted into the groove of the groove plate.

[0014] Preferably, a spring and a top block are fixed to the side wall of the treatment box, and the spring is fixedly connected to the slot plate, the filter is fixed with an extension plate, an electric push rod is fixedly installed on the top of the hollow plate, and the output end of the electric push rod passes through the extension plate, one side of the treatment box is a water-absorbing sponge and the water-absorbing sponge is distributed with irregular holes, the pressure plate is located on one side of the water-absorbing sponge, and the pressure plate passes through a horizontal groove to facilitate water circulation, the bottom of the treatment box located on the orifice plate is a water collecting trough, the water collecting trough is connected to a second drain pipe, and the second drain pipe is also connected to a solenoid valve.

[0015] Preferably, an air pump is installed inside the shell and a sample chamber for sampling gas is provided. The air pump is connected to the air inlet through a first pipe, the air pump is connected to the processing box through a second pipe, the processing box is connected to the sample chamber through a third pipe, and the sample chamber is connected to the exhaust port.

[0016] Preferably, the top of the shell is covered with a shell cover through a disassembly and assembly structure, and a sealing strip and a vertical plate are fixed to the bottom of the shell cover, and the vertical plate passes through a first socket, and the disassembly and assembly structure includes a damping shaft rotatably connected to the inner wall of the shell, and a disc and a turntable are fixed at both ends of the damping shaft, respectively, the disc is located inside the shell, and the turntable is located outside the shell, the disc is provided with an arc groove, a support block is fixed to the inner wall of the shell, and an insertion rod is slidably connected to the inside of the support block, and a second socket is provided on the inner wall of the shell, and a protrusion is fixed to one end of the insertion rod, and the protrusion extends to the inside of the arc groove.

[0017] Preferably, a sealing groove is provided on the top of the shell, and a flexible air cushion is provided on the bottom of the inner cavity of the sealing groove.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the flue gas enters from the sampling tube, the guide cover adopts a conical design with a large opening at one end and a small opening at the other end. During normal sampling, the flue gas flows smoothly from the large opening. When potential backflow occurs, the reverse airflow attempts to enter from the small opening of the guide cover. At this time, the intercepting groove will greatly increase the airflow resistance. Due to the existence of the intercepting groove, the reverse airflow needs to overcome greater resistance to pass through, and the backflowing gas hits the baffle at one end of the guide cover and bounces back, thereby blocking the backflow of the gas. At the same time, the design of the conical guide cover will also shrink the channel of the backflow gas, further increasing the resistance, thereby effectively suppressing the reverse flow of the gas and preventing it from backflowing.

[0020] 2. The entire hood is cooled by the condensing sheet. When the gas passes through the hood, the temperature is reduced. By reducing the gas temperature, the moisture or water in the gas is condensed into water droplets on the inner wall of the hood, and then combined with dry particle dehumidification to achieve a good dehumidification effect. The condensed water droplets then flow along the guide groove to the small opening of the hood. The outflowing water enters the groove inside the sampling head, and then enters the inside of the water tank through the water pipe, thereby realizing the collection and utilization of the condensed water droplets. The condensed water is used for subsequent cooling of the interior of the shell. In summary, the sampling head not only prevents the backflow of flue gas, but also dehumidifies the incoming flue gas, and then cools the interior of the shell through the condensed water generated by dehumidification, thereby realizing the linkage effect between the three.

[0021] 3. When the mesh of the filter is clogged, the micro motor can be started to drive the movable shaft and the pressure rod to rotate. When the pressure rod rotates, the output end of the electric push rod is pushed to move, and then the parts related to the electric push rod move synchronously. The groove plate moves with the filter and stretches the spring. When the filter moves to the appropriate distance, the output end of the electric push rod retracts, and then the spring quickly resets and brings the filter back to reset and hit the top block. The impurities that clog the mesh are ejected through the rebound force and impact force of the filter to achieve cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an appearance diagram of the non-dispersive infrared gas analyzer of the present invention;

[0023] Figure 2 For the present invention Figure 1 Schematic diagram of local structure;

[0024] Figure 3 This is a schematic diagram of the outer cone structure of the drainage cone of the present invention;

[0025] Figure 4 This is a schematic diagram of the inner cone opening structure of the drainage cone of the present invention;

[0026] Figure 5 For the present invention Figure 2 Cross-sectional view;

[0027] Figure 6 It is an enlarged view of position M of the present invention;

[0028] Figure 7 This is a schematic diagram of the internal structure of the non-dispersive infrared gas analyzer of the present invention;

[0029] Figure 8 For the present invention Figure 6 Schematic diagram of local structure;

[0030] Figure 9 A schematic diagram of the housing and housing cover of the present invention;

[0031] Figure 10 A top view of the interior of the housing of the present invention;

[0032] Figure 11 This is a schematic diagram of the interior of the processing box of the present invention;

[0033] Figure 12 For the present invention Figure 9 Schematic diagram after rotation angle;

[0034] Figure 13 A sectional view of a processing box according to the present invention;

[0035] Figure 14 This is a schematic diagram of the hollow plate and shield structure of the present invention;

[0036] Figure 15 It is an enlarged view of Q of the present invention;

[0037] Figure 16 This is a schematic diagram of the disassembly and assembly structure of the present invention;

[0038] Figure 17 It is a schematic diagram of the bottom structure of the shell cover of the present invention.

[0039] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Non-dispersive infrared gas analyzer; 2. Housing; 3. Air inlet; 4. Exhaust port; 5. Sampling tube; 6. Sampling head; 7. Flow guide cover; 8. Interceptor trough; 9. Cavity; 10. Condenser plate; 11. Water tank; 12. Baffle; 13. Water guide pipe; 14. Heat dissipation hole; 15. Hollow tube; 16. Micro pump; 17. Processing box; 18. Orifice plate; 19. Micro motor; 20. Movable shaft; 21. Press rod; 22. Slide; 23. Slot plate; 24. Press plate; 25. Hollow plate; 26. Drying particles; 27. Shield; 28. Filter screen; 29. Spring; 30. Top block; 31. Extension plate; 32. Electric push rod; 33. Water-absorbing sponge; 34. Horizontal groove; 35. Water collecting trough; 36. Air pump; 37. Sample chamber; 38. First pipe; 39. Second pipe; 40. Third pipe; 41. Shell cover; 42. Sealing strip; 43. Vertical plate; 44. First socket; 45. Damping shaft; 46. Disc; 47. Turntable; 48. Arc groove; 49. Support block; 50. Insert rod; 51. Second socket; 52. Bump; 53. Sealing groove; 54. Flexible air cushion; 55. Guide groove; 56. Groove; 57. Drainage cone; 58. Outer cone; 59. Spiral pattern; 60. Inner cone; 61. Flat surface. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] The present invention provides a technical solution: Figures 1-15 The device shown is a petrochemical combustion carbon dioxide content detection device, including a non-dispersive infrared gas analyzer 1. The outside of the non-dispersive infrared gas analyzer 1 is a shell 2. The non-dispersive infrared gas analyzer 1 is provided with an air inlet 3 and an exhaust port 4. The air inlet 3 is connected to a sampling tube 5. One end of the sampling tube 5 is a sampling head 6. The interior of the sampling head 6 is provided with a gas backflow prevention structure. The backflow prevention structure prevents the extracted gas from flowing back and being discharged, thereby ensuring the continuity and accuracy of the detection data. The interior of the shell 2 is provided with a pretreatment structure, which is used to filter and dehumidify the gas.

[0042] Furthermore, the anti-backflow structure includes a guide cover 7 fixed on the inner wall of the sampling head 6, and a cutoff groove 8 is formed between the guide cover 7 and the sampling head 6. A dehumidification unit is provided inside the sampling head 6, and the dehumidification unit includes a cavity 9 provided on the inner wall of the guide cover 7. A condensation sheet 10 is installed inside the cavity 9. A drainage cone 57 is fixed at one end of the sampling head 6, and one end of the drainage cone 57 is an outer cone 58 and a spiral pattern 59 is provided on the surface of the outer cone 58. The other end of the drainage cone 57 is an inner cone 60 and a flat surface 61. The non-dispersive infrared gas analyzer 1 is provided with a collection structure, which includes a guide groove 55 provided on the inner wall of the guide cover 7, and a smaller diameter end of the guide cover 7 is provided. The baffle 12 and the shell 2 are provided with a water tank 11, the sampling head 6 is provided with a groove 56, the sampling head 6 is connected to the water pipe 13 at the groove 56, and the end of the water pipe 13 is connected to the water tank 11. A cooling structure is provided inside the shell 2, and the cooling structure includes a heat dissipation hole 14. Two groups of hollow tubes 15 connected to each other are attached to the inside of the shell 2. A micro pump 16 is installed on the top of the water tank 11. The water suction pipe of the micro pump 16 is located inside the water tank 11. The drain pipe of the micro pump 16 is connected to the hollow tube 15. A water level sensor is installed inside the water tank 11. The bottom of the water tank 11 is connected to a first drain pipe, and the first drain pipe is connected to a solenoid valve.

[0043] Demonstratively, the air pump 36 is started, and the gas is sucked in through the sampling head 6 and the sampling tube 5. Since the deflector 7 adopts a conical design with a large opening at one end and a small opening at the other end, the smoke flows smoothly from the large opening during normal sampling. When potential backflow occurs, the reverse airflow attempts to enter from the small opening of the deflector 7. At this time, the intercepting groove 8 will greatly increase the airflow resistance. Due to the existence of the intercepting groove 8, the reverse airflow needs to overcome greater resistance to pass through, and the backflowing gas hits the baffle 12 at one end of the deflector 7 and bounces back, thereby blocking the backflow of the gas. At the same time, the design of the conical deflector 7 will also shrink the channel for the backflowing gas, further increasing the resistance, thereby effectively suppressing the reverse flow of the gas and preventing it from backflowing. The condensing sheet 10 will The deflector 7 is cooled as a whole, and the temperature of the gas decreases when it passes through the deflector 7. By lowering the gas temperature, the moisture in the gas is condensed into water droplets on the inner wall of the deflector 7 to achieve dehumidification. When the gas enters from the outer cone 58, it will first be diffused by the spiral pattern 59 on the outer cone 58. At the same time, the rotation causes the gas to collide with the cooled inner wall of the deflector 7 at high speed and rotate rapidly, thereby accelerating the efficiency of gas cooling and shortening the time for generating water droplets. The gas is quickly gathered by the centrifugal force of rotation to form liquid water for discharge. The conical design of the drainage cone 57 is more conducive to the entry of gas. When the gas flows back, the inner cone 60 and the flat surface 61 block to form a gas hood, and at the same time, the combined effect with the intercepting groove 8 forms a gas trap, which greatly blocks the backflow of gas through double coordination. Then the condensed water droplets flow along the guide groove 55 to the small opening of the air guide cover 7, and the outflowing water enters the groove 56 inside the sampling head 6, and then enters the inside of the water tank 11 through the water pipe 13, thereby realizing the collection and utilization of the condensed water droplets, and realizing subsequent cooling through the condensed water. In summary, the sampling head 6 realizes the backflow of gas and the dehumidification of the incoming gas, and then realizes the cooling of the inside of the shell 2 through the condensed water generated by dehumidification, thereby realizing the linkage effect between the three.

[0044] Furthermore, the pretreatment structure includes a treatment box 17, a perforated plate 18 is fixed to the bottom of the inner cavity of the treatment box 17, a micro motor 19 is installed on the outer wall of the treatment box 17, the internal rotation of the treatment box 17 is connected to a movable shaft 20, the outside of the movable shaft 20 is fixed with a pressure rod 21, the inner wall of the treatment box 17 is provided with a slide 22, and a slot plate 23 and a pressure plate 24 are connected along the slide 22, the slot plate 23 and the pressure plate 24 are connected by a hollow plate 25, dry particles 26 are placed inside the hollow plate 25, the side of the hollow plate 25 is magnetically connected to the top of the treatment box 17 with a shield plate 27, and the shield plate 27 on the side of the hollow plate 25 is provided with a circular hole, a filter screen 28 is inserted into the slot of the slot plate 23, a spring 29 and a top block 30 are fixed to the side wall of the treatment box 17, and the spring 29 is fixedly connected to the slot plate 23, the filter screen 28 is fixed There is an extension plate 31, and an electric push rod 32 is fixedly installed on the top of the hollow plate 25, and the output end of the electric push rod 32 passes through the extension plate 31. One side of the processing box 17 is a water-absorbing sponge 33 and the water-absorbing sponge 33 is distributed with irregular holes. The pressure plate 24 is located on one side of the water-absorbing sponge 33, and the pressure plate 24 passes through a horizontal groove 34 to facilitate water circulation. The processing box 17 is located at the bottom of the orifice plate 18 as a water collecting tank 35, and the water collecting tank 35 is connected to a second drain pipe, and the second drain pipe is also connected to a solenoid valve. An air pump 36 is installed inside the shell 2 and a sample chamber 37 for sampling gas is provided. The air pump 36 is connected to the air inlet 3 through a first pipe 38, and the air pump 36 is connected to the processing box 17 through a second pipe 39. The processing box 17 is connected to the sample chamber 37 through a third pipe 40, and the sample chamber 37 is connected to the exhaust port 4.

[0045] Specifically, the incoming gas passes through the water-absorbing sponge 33 and is filtered to remove impurities and residual moisture in the gas. In addition, the moisture passes through the baffle 27 on the hollow plate 25 and is absorbed by the dry particles 26 inside it to achieve another dehumidification. The above three dehumidification processes significantly improve the dehumidification efficiency, and the impurities are filtered again through the filter 28. After double filtration by the water-absorbing sponge 33 and the filter 28, the filtering effect is greatly improved, preventing impurities in the gas from causing errors in the detection. The gas then enters the interior of the sample chamber 37 through the third pipe 40. However, when the mesh of the filter 28 is clogged or the water-absorbing sponge 33 is saturated, the micro motor 19 can be started to drive the movable shaft 20 and the pressure rod 21 to rotate. When the pressure rod 21 rotates, it pushes the output end of the electric push rod 32 to move, and then the parts related to the electric push rod 32 move synchronously. The plate 23 moves with the filter 28 and stretches the spring 29. When the filter 28 moves to the appropriate distance, the output end of the electric push rod 32 retracts, and then the spring 29 quickly resets and brings the filter 28 back to its original position and hits the top block 30. The impurities blocking the mesh are ejected by the rebound force and impact force of the filter 28 to achieve cleaning. The sliding groove 22 is provided to provide support for the movement of the slot plate 23. At the same time, the slot plate 23 moves through the hollow plate 25 and moves with the pressure plate 24. When the pressure plate 24 moves, it presses the water-absorbing sponge 33, which is conducive to squeezing out the moisture in the water-absorbing sponge 33 to prevent it from saturation, so as to facilitate its long-term use. The transverse groove 34 on the pressure plate 24 facilitates the passage of the squeezed moisture and gas. The squeezed moisture passes through the orifice plate 18 to the water collection tank 35, and the second drain pipe is activated by the solenoid valve to discharge the moisture in the water collection tank 35.

[0046] Furthermore, the top of the shell 2 is covered with a shell cover 41 through a disassembly structure, and a sealing strip 42 and a vertical plate 43 are fixed to the bottom of the shell cover 41. The vertical plate 43 passes through a first socket 44, and the disassembly structure includes a damping shaft 45 rotatably connected to the inner wall of the shell 2. A disc 46 and a turntable 47 are fixed at both ends of the damping shaft 45. The disc 46 is located inside the shell 2, and the turntable 47 is located outside the shell 2. The disc 46 is provided with an arc groove 48. A support block 49 is fixed to the inner wall of the shell 2. An insertion rod 50 is slidably connected to the inside of the support block 49. A second socket 51 is provided on the inner wall of the shell 2. A protrusion 52 is fixed to one end of the insertion rod 50, and the protrusion 52 extends to the inside of the arc groove 48. A sealing groove 53 is provided on the top of the shell 2, and a flexible air cushion 54 is provided at the bottom of the inner cavity of the sealing groove 53. After the non-dispersive infrared gas analyzer 1 is overhauled, the shell cover 41 is reset. At this time, the damping shaft 45 and the disc 46 are driven to rotate by the turntable 47. Since the protrusion 52 is located inside the arc groove 48, the two insertion rods 50 move in the opposite direction and pass through the first socket 44 on the vertical plate 43 into the second socket 51 on the inner wall of the shell 2, and then the shell cover 41 is installed on the top of the shell 2. The installation is convenient. A dustproof net is provided at the heat dissipation hole 14. At the same time, when the shell cover 41 is reset, the sealing strip 42 at its bottom will enter the sealing groove 53 at the top of the shell 2 and compress the flexible air cushion 54 in the sealing groove 53. The flexible air cushion 54 is deformed to fill the gap between the sealing groove 53 and the sealing strip 42, which is beneficial to prevent dust from entering from the connection between the shell 2 and the shell cover 41, thereby preventing dust from affecting the internal electronic components.

[0047] Specifically, gas backflow can cause sample gas to be discharged in the reverse direction or mixed with the outside air, leading to environmental pollution and distortion of sample composition, seriously affecting the accuracy of test results. Backflow can also cause unstable pressure inside the equipment, damage sensors and analytical instruments, shorten equipment life, and even pose safety risks. Therefore, preventing gas backflow is of great significance to ensuring the reliability of test data and the safe operation of equipment.

[0048] It should be noted that a high-precision electrochemical or NDIR auxiliary gas sensor is installed in sample chamber 37 to monitor the concentration of interfering gases such as CO, CH4, and CO2 in real time. This sensor is connected to the device via RS485 or 4-20mA signal, providing a basis for data compensation to correct the impact of cross-interference on CO2 measurement.

[0049] In addition, the sampling head 7 avoids the flue vortex area and preferentially selects the upper part of the vertical pipe to reduce dust accumulation, and the insertion depth is greater than or equal to 1 / 3 of the flue diameter to ensure representative sampling.

[0050] Furthermore, the sampling tube 5 , the sampling head 6 , and the water conduit 13 are all flexible and retractable, and the sampling tube 5 , the sampling head 6 , and the water conduit 13 can be replaced with longer tubes according to actual working conditions.

[0051] Next, the condenser sheet 10 uses an aluminum nitride ceramic substrate with a thermal conductivity of ≥180W / m·K and a temperature resistance of 800°C as the core carrier. The surface is coated with a 0.1mm thick platinum layer with a melting point of 1772°C as a heat reflective layer to prevent damage by high-temperature gas to achieve active protection. The condenser sheet 10 realizes rapid cooling of the gas.

[0052] It should be noted that the non-dispersive infrared gas analyzer 1 requires an external collection container to receive the water discharged from the two drainage pipes.

[0053] As demonstrated, since the two shielding plates 27 and the hollow plate 25 and the processing box 17 are magnetically attracted, the processing box 17 is opened when the shielding plates 27 are opened, and then the dry particles 26 can be replaced. After that, when the filter screen 28 can no longer be used, it is pulled out from the slot plate 23 and replaced. It should be noted here that the service life of the filter screen 28 is one year, but a pre-treatment structure is required in the middle to prevent the filter screen 28 from being blocked and cleaned, and the cleaning cycle is once every two months.

[0054] It is further explained that compared with the traditional bolt connection between the shell 2 and the shell cover 41, the disassembly and assembly structure has four significant advantages: first, the operating efficiency is improved, and the shell cover 41 can be locked / unlocked within three seconds by simply rotating the turntable 47, while traditional bolts need to be tightened one by one (at least four bolts, taking more than two minutes); second, the sealing performance is better, and the flexible air cushion 54 can form a gapless seal under compression, which far exceeds the flat crimping seal of the bolt connection; third, the anti-loosening reliability is enhanced, and the torque resistance of the damping shaft 45 and the mechanical interlocking of the insert rod 50 can resist vibration shock and avoid the common vibration loosening problem of bolts; fourth, the maintenance cost is reduced, eliminating the need for special tools and there is no risk of thread wear.

[0055] Working principle: Install the non-dispersive infrared gas analyzer 1 at the location where gas sampling is required, and then insert the sampling tube 5 into the outside of the air inlet 3 to achieve connection, and then place the sampling head 6 at the flue where smoke is exhausted during petrochemical combustion. Through the anti-backflow structure, the air pump 36 is started, and the gas is sucked in through the sampling head 6 and the sampling tube 5. Since the guide cover 7 adopts a conical design, one end is a large mouth and the other end is a small mouth. During normal sampling, the flue gas flows smoothly from the large mouth end. When potential backflow occurs, the reverse airflow attempts to enter from the small mouth end of the guide cover 7. At this time, the intercepting groove 8 will greatly increase the airflow resistance. Due to the existence of the intercepting groove 8, the reverse airflow needs to overcome greater resistance to pass through, and the backflowing gas hits the baffle 12 at one end of the guide cover 7 and bounces back, thereby blocking the gas backflow. At the same time, the design of the conical guide cover 7 will also shrink the channel for the backflow gas, further increasing the resistance, thereby effectively suppressing the reverse flow of the gas to prevent it from backflowing.

[0056] The entire air guide 7 is cooled by the condensing sheet 10, and the temperature of the gas decreases when it passes through the air guide 7. By lowering the gas temperature, the moisture in the gas is condensed into water droplets on the inner wall of the air guide 7 to achieve dehumidification. In addition, when the gas enters from the outer cone 58, it will first be diffused by the spiral pattern 59 on the outer cone 58. At the same time, the rotation causes the gas to collide with the cooled air guide 7 wall at high speed and rotate rapidly, thereby accelerating the efficiency of gas cooling and shortening the time for generating water droplets. The gas is quickly gathered to form liquid water for discharge by the rotating centrifugal force. The conical design of the drainage cone 57 is more conducive to the entry of gas. When the gas flows back, the inner cone 60 and the flat surface 61 block to form a gas hood, and at the same time, the combined effect with the intercepting groove 8 forms a gas trap, which greatly blocks the backflow of gas through double coordination. Then the condensed water droplets flow along the guide groove 55 to the small opening of the air guide cover 7, and the outflowing water enters the groove 56 inside the sampling head 6, and then enters the inside of the water tank 11 through the water pipe 13, thereby realizing the collection and utilization of the condensed water droplets, and realizing subsequent cooling through the condensed water. In summary, the sampling head 6 realizes the backflow of gas and the dehumidification of the incoming gas, and then realizes the cooling of the inside of the shell 2 through the condensed water generated by dehumidification, thereby realizing the linkage effect between the three.

[0057] Start the micro pump 16 to extract the condensed water in the water tank 11 through the suction pipe, and then discharge it into the interior of the hollow tube 15 through the drain pipe. The condensed water then flows inside the hollow tube 15 to form a closed-loop cooling water path, thereby taking away the heat inside the shell 2 to protect the internal electronic components, and cooperating with the heat dissipation holes 14 to greatly improve the cooling effect. The water tank 11 monitors the liquid level in real time through the water level sensor. When the water level reaches the threshold, the solenoid valve opens and the first drain pipe automatically drains the water.

[0058] The drawn-in gas enters the interior of the treatment box 17 through the first pipe 38 and the second pipe 39. The incoming gas passes through the absorbent sponge 33 and impurities and residual moisture in the gas are filtered out. In addition, the moisture passes through the baffle 27 on the hollow plate 25 and is absorbed by the dry particles 26 inside it to achieve another dehumidification. The above three dehumidification processes significantly improve the dehumidification efficiency. In addition, the holes on the absorbent sponge 33 can significantly enhance its effect of filtering impurities and moisture in the gas. In addition, the holes provide a larger specific surface area, making the gas flow smoother and increasing the contact area of the filter medium, which helps to capture tiny dust, dirt and particulate impurities, thereby improving the filtration efficiency. Since the water-absorbing sponge 33 expands after absorbing moisture, the holes can also promote the evaporation or drying of its moisture, thereby reducing the accumulation of moisture in the water-absorbing sponge 33 and reducing the risk of the water-absorbing sponge 33 becoming unusable after being saturated with water. Then, impurities are filtered out again through the filter 28. After double filtration by the water-absorbing sponge 33 and the filter 28, the filtering effect is greatly improved, preventing impurities in the gas from causing errors in the detection. After that, the gas enters the interior of the sample chamber 37 through the third pipe 40, and then, by emitting an infrared light source, after the light passes through the gas sample to be tested in the sample chamber 37, the detector measures the intensity change of the residual light, thereby inferring the concentration of the target gas such as carbon dioxide in the gas, thereby realizing the detection of the carbon dioxide content in the gas.

[0059] However, when the mesh of the filter 28 is clogged or the absorbent sponge 33 is saturated, the micro motor 19 can be started to drive the movable shaft 20 and the pressure rod 21 to rotate. When the pressure rod 21 rotates, the output end of the electric push rod 32 is pushed to move, and then the parts related to the electric push rod 32 move synchronously. The groove plate 23 moves with the filter 28 and stretches the spring 29. When the filter 28 moves to a suitable distance, the output end of the electric push rod 32 retracts, and then the spring 29 quickly resets and brings the filter 28 back to reset and hits the top block 30. Through the return of the filter 28, the filter The elastic force and the impact force will eject the impurities blocking the mesh to achieve cleaning. The sliding groove 22 is provided to provide a support force for the movement of the groove plate 23. At the same time, the groove plate 23 moves through the hollow plate 25 and moves with the pressure plate 24. When the pressure plate 24 moves, it presses the water-absorbing sponge 33, which is conducive to squeezing out the water in the water-absorbing sponge 33 to prevent it from being saturated, so as to facilitate its long-term use. The transverse groove 34 on the pressure plate 24 facilitates the passage of the squeezed water and gas. The squeezed water passes through the orifice plate 18 to the water collecting tank 35, and the second drain pipe is activated by the solenoid valve to discharge the water in the water collecting tank 35.

[0060] After the non-dispersive infrared gas analyzer 1 is overhauled, the shell cover 41 is reset. At this time, the damping shaft 45 and the disc 46 are driven to rotate by the turntable 47. Since the protrusion 52 is located inside the arc groove 48, the two insertion rods 50 move in the opposite direction and pass through the first socket 44 on the vertical plate 43 into the second socket 51 on the inner wall of the shell 2, and then the shell cover 41 is installed on the top of the shell 2. The installation is convenient. At the same time, when the shell cover 41 is reset, the sealing strip 42 at its bottom will enter the sealing groove 53 at the top of the shell 2 and compress the flexible air cushion 54 in the sealing groove 53. The flexible air cushion 54 is deformed to fill the gap between the sealing groove 53 and the sealing strip 42, which is beneficial to prevent dust from entering from the connection between the shell 2 and the shell cover 41, thereby preventing dust from affecting the internal electronic components, and a dustproof net is provided at the heat dissipation hole 14.

[0061] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting carbon dioxide content in petrochemical combustion, comprising a non-dispersive infrared gas analyzer (1), wherein the non-dispersive infrared gas analyzer (1) is provided with a housing (2) on the outside, an air inlet (3) and an air outlet (4), a sampling tube (5) being connected to the air inlet (3), and a sampling head (6) at one end of the sampling tube (5), characterized in that: The sampling head (6) is provided with a gas backflow prevention structure inside, and the backflow prevention structure prevents the extracted gas from flowing back and being discharged, thereby ensuring the continuity and accuracy of the detection data. The housing (2) is provided with a pre-processing structure inside, and the pre-processing structure is used for filtering and dehumidifying the gas.

2. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The anti-backflow structure comprises a flow guide cover (7) fixed on the inner wall of the sampling head (6), a flow interception groove (8) is formed between the flow guide cover (7) and the sampling head (6), a dehumidification unit is arranged inside the sampling head (6), the dehumidification unit comprises a cavity (9) arranged on the inner wall of the flow guide cover (7), a condensation sheet (10) is installed inside the cavity (9), a drainage cone (57) is fixed at one end of the sampling head (6), one end of the drainage cone (57) is an outer cone opening (58) and the surface of the outer cone opening (58) is provided with a spiral pattern (59), and the other end of the drainage cone (57) is an inner cone opening (60) and a flat surface (61).

3. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The non-dispersive infrared gas analyzer (1) is provided with a collection structure, the collection structure comprising a guide groove (55) provided on the inner wall of a guide cover (7), a baffle (12) provided at the end of the guide cover (7) with a smaller diameter, a water tank (11) provided inside the housing (2), the sampling head (6) is provided with a groove (56), the sampling head (6) is connected to a water pipe (13) at the groove (56), and the end of the water pipe (13) is connected to the water tank (11).

4. The petrochemical combustion carbon dioxide content detection device according to claim 3, characterized in that: A cooling structure is provided inside the housing (2), the cooling structure including heat dissipation holes (14); two groups of upper and lower interconnected hollow tubes (15) are attached to the interior of the housing (2); and a micro pump (16) is installed on the top of the water tank (11).

5. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The pretreatment structure includes a treatment box (17), a perforated plate (18) is fixed at the bottom of the inner cavity of the treatment box (17), a micro motor (19) is installed on the outer wall of the treatment box (17), the interior of the treatment box (17) is rotatably connected to a movable shaft (20), the outside of the movable shaft (20) is fixed with a pressure rod (21), the inner wall of the treatment box (17) is provided with a slide groove (22), and a groove plate (23) and a pressure plate (24) are slidably connected along the slide groove (22), the groove plate (23) and the pressure plate (24) are connected by a hollow plate (25), dry particles (26) are placed inside the hollow plate (25), the side of the hollow plate (25) is magnetically connected to the top of the treatment box (17) with a shield plate (27), and a filter screen (28) is inserted into the groove of the groove plate (23).

6. The petrochemical combustion carbon dioxide content detection device according to claim 5, characterized in that: The side wall of the treatment box (17) is fixed with a spring (29) and a top block (30), and the spring (29) is fixedly connected to the slot plate (23). The filter screen (28) is fixed with an extension plate (31). The top of the hollow plate (25) is fixedly installed with an electric push rod (32), and the output end of the electric push rod (32) passes through the extension plate (31). One side of the treatment box (17) is a water-absorbing sponge (33) and the water-absorbing sponge (33) is distributed with irregular holes. The pressure plate (24) is located on one side of the water-absorbing sponge (33) and is penetrated by a transverse groove (34) to facilitate water circulation. The bottom of the treatment box (17) located on the orifice plate (18) is a water collecting tank (35).

7. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: An air pump (36) is installed inside the housing (2) and a sample chamber (37) for sampling gas is provided. The air pump (36) is connected to the air inlet (3) through a first pipe (38), the air pump (36) is connected to the processing box (17) through a second pipe (39), the processing box (17) is connected to the sample chamber (37) through a third pipe (40), and the sample chamber (37) is connected to the exhaust port (4).

8. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The top of the shell (2) is covered with a shell cover (41) through a disassembly structure, and a sealing strip (42) and a vertical plate (43) are fixed to the bottom of the shell cover (41), and the vertical plate (43) is penetrated by a first socket (44). The disassembly structure includes a damping shaft (45) rotatably connected to the inner wall of the shell (2), and a disc (46) and a rotating disk (47) are respectively fixed at both ends of the damping shaft (45), the disc (46) is located inside the shell (2), and the rotating disk (47) is located outside the shell (2).

9. The petrochemical combustion carbon dioxide content detection device according to claim 8, characterized in that: The disc (46) is provided with an arc-shaped groove (48), a support block (49) is fixed to the inner wall of the shell (2), an insertion rod (50) is slidably connected inside the support block (49), a second socket (51) is provided on the inner wall of the shell (2), a protrusion (52) is fixed to one end of the insertion rod (50), and the protrusion (52) extends to the inside of the arc-shaped groove (48).

10. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: A sealing groove (53) is provided on the top of the housing (2), and a flexible air cushion (54) is provided at the bottom of the inner cavity of the sealing groove (53).

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